1 Hydroflow Filtration Systems F I L T R A T I O N S Y S T E M S HYDROFLOW SURFACE FILTRATION Versus DEPTH FILTRATION In Metalworking Fluids SURFACE.
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
SURFACE FILTRATION Versus DEPTH FILTRATION In Metalworking Fluids
SURFACE FILTRATION, refers to a method which traps particulate on the surface of a disposable or permanent filter media. The solids in the fluid need to stack up on each other and build a filter cake to increase the effectiveness and efficiency of the system. In flat bed vacuum or pressure filters, the performance depends on the nature of the solids, the distribution of the particle sizes and the velocity thought the media. Generally, 15-20 Micron is the best level of filtration on flat bed, surface filters – ROLL MEDIA OR PERMANENT MEDIA VACUUM AND PRESSURE FILTERS
DEPTH FILTRATION, refers to a method which traps particles throughout the cross-section of the filter medium. These are also referred to as Pre-Coat Filters. In the case of the Star Filter, the medium is the cellulose “filter aid” which provides a wide distribution of particles, establishes an effective filter cake and provides great dirty holding capacity. Because of the many types and grades of available filter-aids, Pre-Coat Filters can provide filtration to 1 Micron. PRECOATED PRESSURE FILTERS, STAR FILTER
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
A Wide Distribution Of
Particle Size And Shape
Creates The Best Filter Cake
And Yields High Filter Efficiency
Coarse Grinding, Aluminum Oxide Wheels Conventional and Creep Feed Grinding, Where A Mix Of Material And Wheel Brake Down Is Present
BUILDING A FILTER CAKE
Filter Cake
Filter Media Or Septum
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
A Narrow Distribution Of
Particle Size And Shape
Seals Off The Filter Media
Which Results In Less Dirt Holding
And Increase Operation Cost
Fine Grinding, Honing
Diamond & CBN Wheels
Cast Iron, Carbide, Glass & Ceramics
SURFACE BLINDING
Surface BlindingFilter Media Or Septum
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
A Filter Aid Can Be Used To
“Precoat” The Filter Septum
Creating A Filter Cake For Trapping
The Fine Particulate
FILTER AIDS - PRECOAT
Precoat FilterFilter Media Or Septum
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
THE KEY INGREDIENTS TO BUILDING A CAKE:
Good Distribution Of Solids
Large Amount Of Filter Area
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
In Cake Building applications, The amount of dirt a given area can hold is based on the flow rate or velocity through the media
FILTER AREA
Low Flow Allows The Cake To Build, Keeping The Paths Open For Additional
Flow To Pass and Dirt to be captured
10 Square Feet Of Filter Area.
High Flow Causes The Cake To Compress, Restricting The Paths,
Leading To Premature Loading
1 Square Foot Of Filter Area.
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
Permanent Or Disposable Roll Media
Reduces The Ability To Build A Cake And Leads To Surface Blinding And Reduced Efficiency
Heavy Dirt Load And / Or A Poor Distribution Of Particle Shape & Size
FLAT BED SURFACE FILTRATION
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
Contaminates Are Trapped Within The Cake
Cellulose Filter Aid Creates A True Depth Cake
Which Increases Dirt Holding Capacity And Filtration Efficiency
STAR FILTER DEPTH FILTRATION
MIC
RO
SC
RE
EN
S
EP
TU
M
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
The New Media Quickly “Blinds Off” Resulting In Rapid Regenerations
Regeneration Cycle Introduces Small Section Of New Media
Flow Takes The Path Of Least Resistance, Quickly Coating The New Section
FLAT BED FILTER REGENERATION
Permanent Or Disposable Roll Media
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Hydroflow Filtration SystemsF I L T R A T I O N S Y S T E M S
HYDROFLOW
The Entire Filter Area Is Renewed And Recoated So The Velocity Stays Low Resulting In Long Efficient Filter Cycles
Increase In Vacuum Compress The Filter Cake, Restricting Flow
A Gentile Backwash Of Clean Fluid Releases The Compact Filter Cake
The Dense Filter Cake, Laden With Solids Quickly Settles To The Conveyor
STAR FILTER REGENERATION CYCLE
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